88 MORPHOLOGY AND EVOLUTION
proximal part of the palm, with the exception of the hypothenar eminence, has lines radiating laterally or antero-posteriorly. On the hypothenar eminence the lines form arches.
The foot, like the hand, is long and narrow, and its digits are arranged in the same way. Thus the hallux is short, and the middle digit is the longest. The basal line, as regards the action of the rnusculi interossei, is drawn through the middle digit in both hand and foot, whereas it runs through the second digit in the foot in Man and the Gorilla. The toes, with the exception of the hallux, are also webbed in their proximal parts. The flexure lines are variable, but to a less extent than those on the hand. Their arrangement in the young male animal examined by me is shown in fig. 20; and it is more intricate than in animals described by some authors. It shows that the foot is a prehensile organ. The hallux has several deep lines. The hallucal lines are more pronounced than the pollical lines. The back of the foot is hairy, but the toes are hairless, and devoid of the callosities which are so pronounced on the fingers.
The hallux is thicker than the other digits, which vary in appearance in different animals. Thus I observed them to be long and slender in a young female, but they were more stumpy in a young male, which had almost the same dimensions of body.
As these animals were undoubted examples of Anthro-popithecus troglodytes, and the characters of the female foot were similar to those of Troglodytes calvus, as described and figured by Beddard (304), no taxonomic value can be ascribed to these features.
Habits,—Those who have studied Chimpanzees in